I have spent a lot of time in my life trying to reconcile the passages in Scripture that can be interpreted legalistically with the passages that outright state that legalism is not what God is looking for from us. I alluded to
this a while back, but how could God in one moment tell us that we don't earn salvation and in the next list the sorts of sins that people who don't get salvation commit? Certainly, this is partially answered by the fact that we sin because we are sinners rather than being sinners because we sin, but there was still something I wasn't getting. There are still things we are supposed to do or not do and it still smacks of legalism.
The strongest example that I could give of a Scripture passage that seems on its face to be legalistic is probably
Ephesians 4:17-5:21. I have heard many, many of what I have considered legalistic sermons quote pieces from this passage. It's tempting to do because Paul is pretty straightforward about a few things that believers shouldn't do. While I have always also felt bad to have a lowly opinion how the passage was used, I also always felt that I was right about this being the wrong approach to the passage. It was only recently that I noticed that the passage itself actually address the potential legalism in 4:22-24, in that our goodness is something God creates rather than something we earn.
"You were taught, with regard to your former way of life, to put off your old self, which is being corrupted by its deceitful desires; to be made new in the attitude of your minds; and to put on the new self, created to be like God in true righteousness and holiness."
In these verses we see that the way to do the right things is not to just to accept Paul's chastening and be better people, but to put on a new self and allow God to change the attitude of our minds. The idea that we're going to stop stealing if our nature is to steal (4:28), or to stop slandering if our nature is to badmouth (4:29), or to do any of the other things listed in the passage without God changing our attitude is ludicrous. Our role is to put off our old selves (4:22) and not give the devil a foothold by clinging unnecessarily to that old self (4:27). It is God who actually performs the changing of our attitude and allows us to put on the new self that is created by Him if we let Him (4:24).
I am posting this on Valentine's Day for a reason. I remember early on in my relationship with Golden I kind of dreaded Valentine's Day, not because I didn't love her, but because I was scared I would break some unwritten rule about the day in what I gave her or did for her. You can say it doesn't matter all you want, but in the first few years of a relationship when you haven't had many Valentine's Days together there's no telling what will be interpreted as, "I don't love you," or, "You aren't special." Now, Valentine's Day does not worry me too much because I understand better what makes Golden feel loved and appreciated.
That Valentine's Day fear of triggering some unknown rule violation is like taking a legalistic approach to God. Early on when we are new in our relationship we have these rules that we follow, even if we don't always understand them, because we don't know if we might accidentally make God mad by doing such-and-such a thing. As we grow in the relationship, though, we should not require rules to understand the life He specifically wants us to live. While some things are flat-out wrong as if they were serious rules that should not be broken, it is the fact that they violate our relationship with God that is wrong rather than that they break some arbitrary rule.
For example, someone who is married should not have to have a rule that says he or she should not cheat on his or her spouse to understand that cheating is violating their relationship. Having to create a rule that says, "No cheating," while perhaps necessary in fragile times in the marriage or when one spouse is a little dense, can frankly be insulting that it was necessary at all. Likewise, as we put on the mind of Christ there are some things that we should intuitively know we personally should or shouldn't do, even though there are not official rules created for them. They may or may not be fine for other believers, depending on what specifically God is requiring of them, but our obedience in this case should not be to a rule book, but to our heart.
The most important aspect of this, though, is that when God expects something of us, it is through Him that it is possible to complete it. We cannot ever be good enough for God. This is important because it flies in the face of the popular, yet legalistic, attitude that says I have to continually try harder in my own power to measure up to God. My role is to submit, put on Christ, and let Him make the necessary changes that will result in me doing the right things. When Jesus said that his yoke was easy and his burden light (
Matt 11:28-30) He was implicitly stating that we would not be doing the bulk of the work ourselves.
A further point that builds off my belief that sin is not breaking a rule, but rather violating a relationship, I think one of the greatest dangers that faces the modern church is the generational rifts and resulting isolation that appear when sin is defined through cultural rules. In both liberal and conservative churches, Evangelical, Mainline Protestant, Catholic,
et al, I believe the priorities are typically in enforcing social mores rather than using Scriptural principles to lead people to an ever-strengthening relationship with Christ. Those are the gnats we strain out while swallowing a camel (
Matt 23:23-28).